Apply the second-round symmetric-Hessian review: output shape, shape check, chunk-size independence - #841

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devmotion wants to merge 11 commits into

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devmotion/symmetric-hessian-output

Commits on Aug 17, 2026

Extract derivatives at the indices of `x`, not of the result

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503fbec
Fix the `Diagonal` allocation test, and the `reshape` wrapper it uncovered

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fea566c
Zero the unwritten entries in the sweep, not in the chunk

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07e4272
Cover the Hessian, and the cases the extraction tests left out

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ec3caa4

Commits on Aug 18, 2026

Take `x` last, and extract a Jacobian column in one place

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27033bb
Cover the wrongly shaped results, the partial final chunks and the static buffer

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3063bff
Merge #840, whose extraction API the Hessian now has to use

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f1e1fbf
Index the Hessian by the linear indices of `x`

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3c74cfe
Restore the result shape check dropped with `extract_jacobian!`

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01c6cb7
Read the same triangle at every chunk size

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f567163
Walk the structural positions of the Hessian sweep

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6279027